We discussed this heavily in ALL of my criminal justice classes. (what you were saying basically)
The question isn't whether it's right or wrong, because thats for ones own opinion. The question is, at what point should the law intervene, if at all?
We discussed extensively if you happen to harm a pregnant woman... well lets just make it clear... if you shoot a pregnant woman with intent to cause death and she dies and happens to be carrying a child in the 1st trimester, is it a double murder?
What if you intentionally shoot her in the stomach intending to kill the "organism" as well as the mother whilst knowing that the mother is in the 1st trimester?
Roe v Wade would say no, yet cases like this happen often and will often aggravate the charges.
So the question isn't "when is it ok to kill the baby?" since it's really never ok to kill the baby. Albeit considering that there are some circumstances where abortion is by far the best option for EVERYONE (including baby) involved, just as there are opposite instances.
The question is moreso, "when does the combination of sperm and egg become a homosapien?"
We also discussed a particular case in which a mother "birthed" a child on her own claiming she had no idea she was pregnant. Then placed the "child" into a shoe box and left it in a trashcan. The question was, what charges can be placed on her? Can you charge someone with child endangerment if it isn't a child? Can you charge someone with homicide if what was killed wasn't a homosapien? Can you be charged with murder if what you "killed" never took any breaths and therefor was never considered legally "alive"?